<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>05数组元素的添加</title>
	<script>
		var arr = [[10,11,12],[20,21,22],[30,31,32]];

		arr[1][2];//10
	</script>
</head>
<body>
	
</body>
</html>